div{
  border: 1px solid black;
}
#manDiv{
  width: 800px;
  height: 400px;
  display: flex;
}
.bookDiv{
  height: 400px;
  width: 400px;
}
#shopDiv{
  position: absolute;
  left: 0px;
  top:0px;
  width: 500px;
  height: 500px;
  background-color: rgba(250,0,0,0.4);
  visibility: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}
#shopContentDiv{
   background-color: white;
  width: 600px;
  height: 400px;
}
